[ http://jira.nhibernate.org/browse/NH-11?page=comments#action_14680 ]
Jerry Haltom commented on NH-11:
--------------------------------
Iesi.Collections.Generic.SortedSet appears to exist now. Perhaps this is a better solution now?
> How to do Sorted Collections
> ----------------------------
>
> Key: NH-11
> URL: http://jira.nhibernate.org/browse/NH-11
> Project: NHibernate
> Type: Task
> Reporter: Mike Doerfler
> Assignee: Mike Doerfler
> Fix For: prealpha
>
> .NET has no interface for a SortedSet (it has no Set interface, but that is a seperate gripe), or a SortedDictionary.
> There is a SortedList, but the definition of a <list> in NHibernate requires an Index column so it defines the order of the items in the List.
> There is a ListDictionary, but that has warnings about performance being better than Dictionary for only up to 10 items. The order of a ListDictionary is based on order of Add or using the AddAt(). It does not use a Comparer to determine where to Add an element.
> The options I can see us having is to:
> 1 - Use an external library that provides SortedSet/SortedDictionary functionallity similar to Javas. I want to stay as close to the .NET SDK as possible since that is what we are using :)
> 2 - Change the meaning of <sorted-set> and <sorted-map> to just be sorted by Add order or AddAt. That would be more consistent with the .NET SDK and that is the way I am leaning.
> The Comparer provided in the mapping would be used to determine the order to Add items from the DataReader to the collection. We could store the objects in a temporary ArrayList while we read from the DataReader and instantiate the objects, then use ArrayList.Sort(IComparer) and iterate through the sorted Array List and Add them to the Set/Dictionary.
> The preferred way would to be to sort them using the order-by mapping attribute because the db would handle the sorting and give us the items in order.
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